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Author:bigeagle From:Internet

    一個用C#寫的windows應用程序，作用嘛，就是對asp程序已知的20種漏洞進行掃描，顯示源程序。在這個應用程序中用到兩種獲得http頁面的方法，一種是直接用httpwebrequest類，而另一種是同服務器通過tcp/ip建立socket連接，直接查詢端口80 ， 為此我寫了以下兩個函數，第一個比較簡單，參數只有一個，就是要求的url , 另外一個比較復雜，也很通用，不僅可以請求http頁面，還可以和其他端口通信，如端口43的whois，端口25的smtp，端口21的ftp甚至pop3等等，三個參數分別是主機名，請求命令和端口。好了，看程序吧。
 
  //獲取http頁面函數
  private string Get_Http(string a_strUrl)
  {
  string strResult ;
  HttpWebRequest myReq = (HttpWebRequest)
  WebRequestFactory.Create(a_strUrl) ;
 
  try
  {
  HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();
  Stream myStream = HttpWResp.GetResponseStream () ;
 
  StreamReader sr = new StreamReader(myStream , Encoding.Default);
  StringBuilder strBuilder = new StringBuilder();
  while (-1 != sr.Peek())
  {
  strBuilder.Append(sr.ReadLine()+"\r\n");
  }
 
  strResult = strBuilder.ToString();
  }
  catch(Exception exp)
  {
  strResult = "錯誤：" + exp.Message ;
  }
 
  return strResult ;
 
  }
 
 
  //通過同server建立tcp/ip連接，發送socket命令
  private string Get_Socket_Request(string a_strServer , string a_strRequest , Int32 a_intPort)
  {
  //Set up variables and String to write to the server
  Encoding ASCII = Encoding.Default ;
  string Get = a_strRequest + "Connection: Close\r\n\r\n";
  //string Get =
  Byte[] ByteGet = ASCII.GetBytes(Get);
  Byte[] RecvBytes = new Byte[256];
  String strRetPage = null;
 
  // IPAddress and IPEndPoint represent the endpoint that will
  // receive the request
  IPAddress hostadd = DNS.Resolve(a_strServer.Substring(7 ,a_strServer.Length - 7));
  IPEndPoint EPhost = new IPEndPoint(hostadd, a_intPort);
 
  //Create the Socket for sending data over TCP
  Socket s = new Socket(AddressFamily.AfINet, SocketType.SockStream,
  ProtocolType.ProtTCP );
 
  // Connect to host using IPEndPoint
  if (s.Connect(EPhost) != 0)
  {
  strRetPage = "Unable to connect to host";
  return strRetPage;
  }
 
  // Sent the GET text to the host
  s.Send(ByteGet, ByteGet.Length, 0);
 
  // Receive the page, loop until all bytes are received
  Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
  strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
 
  while (bytes > 0)
  {
  bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
  strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
  }
 
  return strRetPage ;
  }